/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.yammp.widget;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.Checkable;
import android.widget.RelativeLayout;

/**
 * A special variation of RelativeLayout that can be used as a checkable object.
 * This allows it to be used as the top-level view of a list view item, which
 * also supports checking. Otherwise, it works identically to a RelativeLayout.
 */
public class CheckableRelativeLayout extends RelativeLayout implements Checkable {

	private boolean mChecked;

	private static final int[] CHECKED_STATE_SET = { android.R.attr.state_checked };

	public CheckableRelativeLayout(Context context, AttributeSet attrs) {

		super(context, attrs);
	}

	@Override
	public boolean isChecked() {

		return mChecked;
	}

	@Override
	public void setChecked(boolean checked) {

		if (mChecked != checked) {
			mChecked = checked;
			refreshDrawableState();
		}
	}

	@Override
	public void toggle() {

		setChecked(!mChecked);
	}

	@Override
	protected int[] onCreateDrawableState(int extraSpace) {

		final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
		if (isChecked()) {
			mergeDrawableStates(drawableState, CHECKED_STATE_SET);
		}
		return drawableState;
	}
}
